He looked super cute in a "Frozen"-themed dress.

Earlier this week, the "Transformers" star posted a pic showing her beautiful family, which generated some backlash among people who just couldn't get over the fact that a boy was wearing a garment that has traditionally been worn by girls.

"No values. No morals. Promoting gay perversion. Destruction of traditional gender roles lead to a totalitarian society granting government officials more power," one user commented. Another wrote, "Your boy MUST be a MAN, what a shameful time to grow up."

Oh boy.

Putting aside the fact that more and more men and boys are subverting gender norms and wearing clothes that have historically been worn by the opposite sex (hi, Jaden Smith!), isn't it fair to say that kids should be allowed to wear what they want? Who cares if boys wear dresses or if girls wear pants? Let them be kids!

Isn't it fair to say that kids should be allowed to wear what they want?

Other commenters had this thought in mind, too.

One Instagram user wrote, "My son rocks an Elsa dress almost daily. <3," while another quipped, "Let kids be kids!!!! stop prejudice!!"

But Fox isn't the only celeb who has faced criticism for letting her kid rock their gender fluidity.

Fox has previously spoken out about letting her son wear dresses, noting that she doesn't want to get in the way of his self-expression.

The boys can wear dresses... you can be whatever you want to be in my house.

"The boys can wear dresses. Noah wears dresses so there are no rules — you can be whatever you want to be in my house," she told Jimmy Kimmel last year.

"I grew up in a Pentecostal household, it's Southern Christian," she explained. "The women in the church are only allowed to wear pants, you can't wear dresses, you can't wear make-up or jewelry, so it's a really sort of oppressive environment to grow up in. But I sort of lean left of that now."